Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual é a média do eleitorado com votos de 28.475 e estragados menores que 5.779?
 ###Tabelas: CREATE TABLE main_songlist (main_songlist_id AUTO_INCREMENT PRIMARY KEY, Track INT, Song Title VARCHAR, Artist VARCHAR, Album VARCHAR, Legends Track? VARCHAR) CREATE TABLE plebiscite (plebiscite_id AUTO_INCREMENT PRIMARY KEY, Constituency VARCHAR, Electorate INT, Votes INT, Turnout INT, Spoilt INT, Percent Yes INT) CREATE TABLE doubles_21_13–8 (doubles_21_13–8_id AUTO_INCREMENT PRIMARY KEY, Outcome VARCHAR, Date VARCHAR, Tournament VARCHAR, Surface VARCHAR, Partner VARCHAR, Opponents in the final VARCHAR, Score VARCHAR) CREATE TABLE composition_of_the_6th_seanad (composition_of_the_6th_seanad_id AUTO_INCREMENT PRIMARY KEY, Administrative Panel INT, Agricultural Panel INT, Cultural and Educational Panel INT, Industrial and Commercial Panel INT, Labour Panel INT, National University of Ireland INT, University of Dublin INT, Nominated by the Taoiseach INT, Total INT) CREATE TABLE sunshine_tour_wins_6 (sunshine_tour_wins_6_id AUTO_INCREMENT PRIMARY KEY, Date VARCHAR, Tournament VARCHAR, Winning score VARCHAR, Margin of victory VARCHAR, Runner(s)-up VARCHAR)  
SELECT AVG Electorate FROM plebiscite WHERE Votes = 28,475 AND Spoilt < 5,779